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2 | pj | 1 | /* Project: OSLib |
2 | * Description: The OS Construction Kit |
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3 | * Date: 1.6.2000 |
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4 | * Idea by: Luca Abeni & Gerardo Lamastra |
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5 | * |
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6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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7 | * low-level infrastructure for developing OS kernels and Embedded |
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8 | * Applications; it partially derives from the HARTIK project but it |
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9 | * currently is independently developed. |
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10 | * |
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11 | * OSLib is distributed under GPL License, and some of its code has |
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12 | * been derived from the Linux kernel source; also some important |
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13 | * ideas come from studying the DJGPP go32 extender. |
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14 | * |
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15 | * We acknowledge the Linux Community, Free Software Foundation, |
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16 | * D.J. Delorie and all the other developers who believe in the |
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17 | * freedom of software and ideas. |
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18 | * |
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19 | * For legalese, check out the included GPL license. |
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20 | */ |
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21 | |||
120 | giacomo | 22 | /* Added Advanced Timer Code |
23 | * |
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24 | * Date: 8.4.2003 |
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25 | * Author: Giacomo Guidi <giacomo@gandalf.sssup.it> |
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26 | * |
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27 | */ |
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28 | |||
2 | pj | 29 | /* Time Event routines */ |
30 | |||
1621 | fabio | 31 | #include <arch/i386/stdlib.h> |
2 | pj | 32 | #include <ll/i386/mem.h> |
33 | #include <ll/i386/error.h> |
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34 | #include <ll/i386/hw-arch.h> |
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40 | pj | 35 | #include <ll/i386/pic.h> |
2 | pj | 36 | #include <ll/i386/pit.h> |
299 | giacomo | 37 | #include <ll/i386/apic.h> |
131 | giacomo | 38 | #include <ll/i386/advtimer.h> |
305 | giacomo | 39 | #include <ll/i386/64bit.h> |
131 | giacomo | 40 | |
2 | pj | 41 | #include <ll/sys/ll/ll-data.h> |
42 | #include <ll/sys/ll/ll-instr.h> |
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304 | giacomo | 43 | #include <ll/sys/ll/ll-func.h> |
2 | pj | 44 | #include <ll/sys/ll/time.h> |
45 | #include <ll/sys/ll/event.h> |
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46 | |||
353 | giacomo | 47 | #include <tracer.h> |
48 | extern unsigned short int currCtx; |
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49 | |||
2 | pj | 50 | FILE(Event); |
51 | |||
52 | extern LL_ARCH ll_arch; |
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53 | |||
54 | BYTE frc; |
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55 | |||
56 | /* Timer 0 usec base tick */ |
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57 | DWORD ticksize; |
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58 | |||
59 | /* Timer 0 loaded time constant (= ticksize * 1.197) */ |
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60 | WORD pit_time_const; |
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61 | DWORD timermode; |
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62 | |||
63 | static DWORD nts; /* System tick in nanoSeconds... */ |
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64 | struct timespec actTime; /* Time (in nanosecs)... */ |
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65 | extern int activeInt; |
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66 | |||
67 | WORD lastTime; |
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68 | struct pitspec globalCounter; |
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69 | |||
70 | struct event eventlist[MAX_EVENT]; |
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71 | |||
72 | struct event *freeevents; |
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73 | struct event *firstevent; |
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74 | |||
75 | extern void *last_handler; |
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76 | extern void (*evt_prol) (void); |
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77 | extern void (*evt_epil) (void); |
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78 | |||
305 | giacomo | 79 | extern unsigned int apic_clk_per_msec; |
619 | mauro | 80 | extern unsigned char use_apic, use_tsc; |
120 | giacomo | 81 | |
40 | pj | 82 | void event_setlasthandler(void *p) |
83 | { |
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619 | mauro | 84 | last_handler = p; |
40 | pj | 85 | } |
2 | pj | 86 | |
87 | void event_setprologue(void *p) |
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88 | { |
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619 | mauro | 89 | evt_prol = p; |
2 | pj | 90 | } |
91 | |||
92 | void event_setepilogue(void *p) |
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93 | { |
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619 | mauro | 94 | evt_epil = p; |
2 | pj | 95 | } |
96 | |||
97 | /* Switched to timespec */ |
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619 | mauro | 98 | int periodic_event_post(struct timespec time, void (*handler) (void *p), void *par) |
2 | pj | 99 | { |
619 | mauro | 100 | struct event *p; |
101 | struct event *p1, *t; |
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2 | pj | 102 | |
619 | mauro | 103 | TRACER_LOGEVENT(FTrace_EVT_timer_post, 0, 0); |
353 | giacomo | 104 | |
619 | mauro | 105 | if (!freeevents) { |
106 | message("NO FREE EVENTS !\n"); |
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107 | ll_abort(20); |
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108 | return -1; |
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109 | } |
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2 | pj | 110 | |
619 | mauro | 111 | /* Extract from the ``free events'' queue */ |
112 | p = freeevents; |
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113 | freeevents = p->next; |
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2 | pj | 114 | |
619 | mauro | 115 | /* Fill the event fields */ |
116 | p->handler = handler; |
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117 | TIMESPEC_ASSIGN(&(p->time), &time); |
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118 | p->par = par; |
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2 | pj | 119 | |
619 | mauro | 120 | /* ...And insert it in the event queue!!! */ |
2 | pj | 121 | |
619 | mauro | 122 | t = NULL; |
123 | /* walk through list, finding spot, adjusting ticks parameter */ |
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124 | for (p1 = firstevent; p1; p1 = t->next) { |
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2 | pj | 125 | /* |
126 | SUBTIMESPEC(&time, &(p1->time), &tmp); |
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127 | if ((tmp.tv_sec > 0) && (tmp.tv_nsec > 0)) { |
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128 | */ |
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619 | mauro | 129 | if (TIMESPEC_A_GT_B(&time, &p1->time)) |
130 | t = p1; |
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131 | else |
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132 | break; |
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133 | } |
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2 | pj | 134 | |
619 | mauro | 135 | /* adjust next entry */ |
136 | if (t) { |
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137 | t->next = p; |
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138 | } else { |
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139 | firstevent = p; |
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140 | } |
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141 | p->next = p1; |
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2 | pj | 142 | |
619 | mauro | 143 | return p->index; |
2 | pj | 144 | } |
145 | |||
146 | int periodic_event_delete(int index) |
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147 | { |
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619 | mauro | 148 | struct event *p1, *t; |
2 | pj | 149 | |
619 | mauro | 150 | TRACER_LOGEVENT(FTrace_EVT_timer_delete, 0, 0); |
353 | giacomo | 151 | |
619 | mauro | 152 | if (index == -1) |
153 | return -1; |
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496 | giacomo | 154 | |
619 | mauro | 155 | t = NULL; |
156 | /* walk through list, finding spot, adjusting ticks parameter */ |
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157 | for (p1 = firstevent; (p1) && (index != p1->index); p1 = t->next) { |
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158 | t = p1; |
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159 | } |
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2 | pj | 160 | |
619 | mauro | 161 | if (p1 == NULL) { |
162 | return -1; |
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163 | } |
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2 | pj | 164 | |
619 | mauro | 165 | if (t == NULL) { |
166 | firstevent = p1->next; |
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167 | } else { |
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168 | t->next = p1->next; |
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169 | } |
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170 | p1->next = freeevents; |
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171 | freeevents = p1; |
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2 | pj | 172 | |
619 | mauro | 173 | return 1; |
2 | pj | 174 | } |
175 | |||
176 | void periodic_wake_up(void) |
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619 | mauro | 177 | { |
178 | /* CHANGE the NAME, please... */ |
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179 | struct event *p, *pp; |
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180 | WORD tmp; |
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2 | pj | 181 | |
619 | mauro | 182 | TRACER_LOGEVENT(FTrace_EVT_timer_wakeup_start, 0, 0); |
353 | giacomo | 183 | |
620 | mauro | 184 | if (!use_tsc) { |
619 | mauro | 185 | tmp = pit_read(frc); |
186 | ADDPITSPEC((WORD) (lastTime - tmp), &globalCounter); |
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187 | lastTime = tmp; |
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188 | } |
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2 | pj | 189 | |
619 | mauro | 190 | activeInt++; |
191 | if (activeInt == 1 && evt_prol != NULL) { |
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192 | evt_prol(); |
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193 | } |
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194 | |||
195 | if (use_tsc) |
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196 | ll_read_timespec(&actTime); |
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197 | else |
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198 | ADDNANO2TIMESPEC(nts, &actTime); |
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120 | giacomo | 199 | |
619 | mauro | 200 | for (p = firstevent; p != NULL; p = pp) { |
201 | /* |
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2 | pj | 202 | SUBTIMESPEC(&(p->time), &actTime, &tmp); |
203 | if ((tmp.tv_sec > 0) && (tmp.tv_nsec > 0)) { |
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204 | break; |
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205 | } */ |
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619 | mauro | 206 | if ((p->time.tv_sec > actTime.tv_sec) || |
207 | ((p->time.tv_sec == actTime.tv_sec) |
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208 | && (p->time.tv_nsec > actTime.tv_nsec))) { |
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209 | break; |
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210 | } |
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211 | pp = p->next; |
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212 | p->next = freeevents; |
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213 | freeevents = p; |
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214 | firstevent = pp; |
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215 | p->handler(p->par); |
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2 | pj | 216 | } |
217 | |||
619 | mauro | 218 | if (activeInt == 1 && evt_epil != NULL) { |
219 | evt_epil(); |
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220 | } |
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221 | activeInt--; |
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353 | giacomo | 222 | |
619 | mauro | 223 | TRACER_LOGEVENT(FTrace_EVT_timer_wakeup_end, (unsigned short int)currCtx, 0); |
2 | pj | 224 | } |
225 | |||
226 | void event_init(struct ll_initparms *l) |
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227 | { |
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619 | mauro | 228 | extern void ll_timer(void); |
229 | extern void ll_apic_timer(void); |
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230 | int i; |
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231 | BYTE mask; |
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232 | TIME t; |
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233 | DWORD apic_clk; |
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2 | pj | 234 | |
648 | mauro | 235 | ll_init_advtimer(); |
265 | giacomo | 236 | |
619 | mauro | 237 | if (use_apic) |
238 | IDT_place(0x39,ll_apic_timer); |
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239 | else |
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240 | IDT_place(0x40,ll_timer); |
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2 | pj | 241 | |
619 | mauro | 242 | if (l->mode != LL_PERIODIC) { |
243 | message("One-shot mode\n"); |
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244 | t = 0; |
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245 | if (use_apic) { |
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246 | set_APIC_timer(0xFFFFFFFF); |
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247 | enable_APIC_timer(); |
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248 | } else { |
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249 | /* Mode: Binary/Mode 4/16 bit Time_const/Counter 0 */ |
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250 | pit_init(0, TMR_MD4, 0xFFFF); /* Timer 0, Mode 4, constant 0xFFFF */ |
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251 | } |
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252 | } else { |
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253 | t = l->tick; |
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299 | giacomo | 254 | |
619 | mauro | 255 | /* Translate the tick value in usec into a suitable time constant */ |
256 | /* for 8254 timer chip; the chip is driven with a 1.19718 MHz */ |
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257 | /* frequency; then the effective frequency is given by the base */ |
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258 | /* frequency divided for the time constant; the tick is the inverse */ |
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259 | /* of this effective frequency (in usec!) */ |
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260 | /* Time-Constant = f_base (MHz) * tick (usec) */ |
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261 | /* If T-C == 0 -> T-C = 65536 (Max available) */ |
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262 | ticksize = t; |
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265 | giacomo | 263 | |
619 | mauro | 264 | if (use_apic) { |
265 | mul32div32to32(t,apic_clk_per_msec,1000,apic_clk); |
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266 | set_APIC_timer(apic_clk); |
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267 | enable_APIC_timer(); |
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268 | } else { |
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269 | mul32div32to32(t,1193182,1000000,t); |
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2 | pj | 270 | |
619 | mauro | 271 | /* Only for security! This should cause timer overrun */ |
272 | /* While 0 would set maximum period on timer */ |
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273 | if (t == 0) |
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274 | t = 1; |
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275 | pit_time_const = (WORD) (t & 0xFFFF); |
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276 | /* Mode: Binary/Mode 2/16 bit Time_const/Counter 0 */ |
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277 | pit_init(0, TMR_MD2, t); /* Timer 0, Mode 2, Time constant t */ |
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278 | } |
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279 | } |
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280 | timermode = l->mode; |
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301 | giacomo | 281 | |
619 | mauro | 282 | if (!use_apic) { |
283 | if (ll_arch.x86.cpu > 4) { |
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284 | /* Timer1: mode 0, time const 0... */ |
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285 | pit_init(1, TMR_MD0, 0); |
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286 | frc = 1; |
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287 | } else { |
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288 | frc = 2; |
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289 | pit_init(2, TMR_MD0, 0); |
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290 | outp(0x61, 3); |
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291 | } |
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292 | } |
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2 | pj | 293 | |
619 | mauro | 294 | mask = ll_in(0x21); |
295 | mask &= 0xFE; /* 0xFE = ~0x01 */ |
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296 | ll_out(0x21, mask); |
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301 | giacomo | 297 | |
619 | mauro | 298 | /* Init the event list... */ |
299 | for (i = 0; i < MAX_EVENT; i++) { |
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300 | if (i < MAX_EVENT - 1) { |
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301 | eventlist[i].next = &(eventlist[i + 1]); |
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302 | } |
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303 | eventlist[i].index = i; |
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2 | pj | 304 | } |
619 | mauro | 305 | eventlist[MAX_EVENT - 1].next = NULL; |
306 | freeevents = &(eventlist[0]); |
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2 | pj | 307 | |
619 | mauro | 308 | evt_prol = NULL; |
309 | evt_epil = NULL; |
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2 | pj | 310 | |
619 | mauro | 311 | /* Initialization of the time variables for periodic mode */ |
312 | nts = ticksize * 1000; |
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313 | NULL_TIMESPEC(&actTime); |
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120 | giacomo | 314 | |
619 | mauro | 315 | /* Initialization of the general time variables */ |
316 | NULLPITSPEC(&globalCounter); |
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317 | lastTime = 0; |
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2 | pj | 318 | |
619 | mauro | 319 | if (timermode == LL_PERIODIC) { |
320 | event_post = periodic_event_post; |
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321 | event_delete = periodic_event_delete; |
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322 | } else { |
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323 | event_post = oneshot_event_post; |
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324 | event_delete = oneshot_event_delete; |
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325 | } |
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40 | pj | 326 | |
619 | mauro | 327 | /* Last but not least... */ |
328 | if (!use_apic) |
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329 | irq_unmask(0); |
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2 | pj | 330 | } |